Tread for pneumatic tires.



F. G. WARD.

TRBAD FOR PNEUMATIO TIRES.

APPLICATION FILED APR. 19, 1907.

1,021,171 Patented M3126, 1912.

UNITED sTATEs PATENT OFFICE.

FREDERICK e. Wann, orn'rsnunen, -PNNSYLVANIA AssrGNon or ONE-'mitin ToHARRY Davis, or rrrrs'numm PENNSYLVANIA.

Specification of Letters Patent.

Application iiled April 19, 1907. Serial No. 369,140.

TBEAD FOR `PII'IILUMMPIO TIRES.

Patented Mar. 26,1912.

To all whom t may concern.'

Be it known that I, FREDERICK G. WARD a citizen of the United States,residing at Pittsburgh, in the count-y of'Allegheny and State ofPennsylvania, have invented a new and useful Tread for Pneumatic Tires,of which the following is a specification.

This invention relates to improvements' in pneumatic tires and morelparticularly to treads therefor designed to be formed with the tire orto be connected thereto subsequent to the formation thereof.

The object of the invention is to provide a tread designed for use uponheavy automobile tires and whereby skidding is prevented when thevehicle is rounding curves.

Ay still further object is to provide a tread y of this characterutilizing wire coils, portions of which are exposed throughthe surfaceof the tread, said coils being interwoven so as to prevent. any of thewires fro'm being stripped from the tire should it become caught in Ianobject upon the road.

With these and other objects in view the invention consistsof certainnovel features of construction and combinations of parts which will behereinafter more fully described and pointed out in the claims.

In the accompanying drawings is shown` the preferred form of theinvention.

In said drawings: Figure 1 is a transverse section through a portion ofthe tire and showing a tread thereon constructed in accordance with thepresent invention; Fig. 2 is a similar View showing the tread formedwith the tire; Fig. 8 is a plan view of a por-A tion of a tire showingamodified form of the tread applied thereto; and Fig. 4 is an enlargedsection through a portion of the coils of the tread.

lReferring to the igures by characters of reference, 1, 1 designateparallel interwoven series of spring wires, each series consistingpreferably of four similar wires coiled together. These coils areinterwoven throughout their lengths and extend around the length of theent-ire tread which is made up, in addition to the wire coils 1, of ahigh grade of rubber 2 which completely fills the coils 1 and inclosesall portions of the coils except the outermost portion of each whirlthereof. These. exposedv portions appear upon the face of the tread atregular 1ntervals as shown at 3 in Fig. 3.

ner it is cemented or otherwise secured with in an annular recess orgroove 4 formed in the outer face of the tire as shown in Fig. 1. Ifpreferred, however, this improved tread can be formed within the tirewhile said tire is being manufactured simply by embeddingl -the wiremesh made up of the interlocked coils 1 so that only the outer portionof each coil will be exposed upon the outer face of the tread. Thisconstruction has been illustrated in Fig. 2. Whether or not the tread beformed with the tire or is applied thereto subsequent tothe constructionof the tire the advantages derived therefrom are the same. By utilizingcoils having exposed portions the tire is prevented from skidding whenyrounding curves and by having interlocked coils it becomes impossible tostrip a wire from the tire should the exposed portion thereof becomeentangled in any nonyielding -object upon the road bed. The wire wouldbreak instead of becoming stripped from the tread as would be the caseif the coils were not interlocked. Where the tready is prepared as anarticle of manufacture it can be used for repairing worn tire treads.

In order that the coils may be prevented from shifting their relativepositions within the rubber and cutting it, it is designed to immersethe interlocketl wires in a molten metal which, when' cooled, will bindthe whirls together. This metal may be an alloy of such a nature as topermit the rubber to be vulcanized thereto.

What is claimed is:

1. A tire. of resilient material having embedded in the tread portionthereof a plurality of helices so disposed that portions thereof areiiush with the road-engaging surface of the tire.

2. A tire of resilient material having embedded in the tread portionthereof -a plurality of metallic helices having portions thereof flushwith the road-engaging surface of the tire and having thelr axesdisposed in planes parallel to the road-engaging face of the tire.

3. A tire of resilient material having embedded 4in the tread portionthereof a metallic helix having portions thereof iush with theroad-engaging surface of the tire and being disposed circumferentiallyof the tire.

4. A tire of resilient material having embedded in the resilientmaterial thereof a structure comprising a plurality of layers ofmet-allie coils, portions of the bent rodsor Wires of the outer layerbeing iush with the road-engaging surface of the tire.

5. A tire of resilient material provided in its tread with a pluralityof interlaced helices embedded in the resilient material and havingportions 4of each helix flush with the road-engaging surface of thetire.

6. A tire having a tread made up of annularly disposed coils embeddedWithin the tire, portions of each coil being exposed upon the tread.

7. A tire having'interwoven metal coils embedded in the tread thereof, aportion of each Whirl of the coils being exposed upon the tread.

8. A tread for tires comprising a plurality of coils disposedlongitudinally of the tire and a rubber filling and covering there-1,oa1,171 i for, said coils being exposed through the outer face of thecovering.

9. A tread for tires consisting of inter- Woven metal coils disposedlongitudinally of the tire and a rubber covering and filling therefor,portions of the coils being exposed through. the outer face of theVcovering. A

V10. A tire tread, a substantially continuous elastic member embeddedtherein and coiled in the direction of the,circumference, and havingportions of its coil exposed upon the tread.

11. A tire tread, a plurality of laterally.

FREDERICK e. WARD.

Witnesses:

C. E. FARRINGTON, H. W.. Dunes.

